.btn {
  padding: 5px 8px;
  border-radius: 3px;
  
  border: 1px solid;
  cursor: pointer;
  margin: 5px;
}
/* primary */
.btn-primary {
    color: #fff;
    background-color: #007bff;
    border-color: #007bff;
  }
  
  .btn-primary:hover {
    color: #fff;
    background-color: #0069d9;
    border-color: #0062cc;
  }
  
  .btn-primary:focus, .btn-primary.focus {
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.5);
  }
  
  .btn-primary.disabled, .btn-primary:disabled {
    color: #fff;
    background-color: #007bff;
    border-color: #007bff;
  }
  
  /* secondary */
  .btn-secondary {
    color: #fff;
    background-color: #6c757d;
    border-color: #6c757d;
  }
  
  .btn-secondary:hover {
    color: #fff;
    background-color: #5a6268;
    border-color: #545b62;
  }
  
  .btn-secondary:focus, .btn-secondary.focus {
    box-shadow: 0 0 0 0.2rem rgba(108, 117, 125, 0.5);
  }
  
  .btn-secondary.disabled, .btn-secondary:disabled {
    color: #fff;
    background-color: #6c757d;
    border-color: #6c757d;
  }
  
  /* success */
  .btn-success {
    color: #fff;
    background-color: #28a745;
    border-color: #28a745;
  }
  
  .btn-success:hover {
    color: #fff;
    background-color: #218838;
    border-color: #1e7e34;
  }
  
  .btn-success:focus, .btn-success.focus {
    box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.5);
  }
  
  .btn-success.disabled, .btn-success:disabled {
    color: #fff;
    background-color: #28a745;
    border-color: #28a745;
  }
  
  /* danger */
  .btn-danger {
    color: #fff;
    background-color: #dc3545;
    border-color: #dc3545;
  }
  
  .btn-danger:hover {
    color: #fff;
    background-color: #c82333;
    border-color: #bd2130;
  }
  
  .btn-danger:focus, .btn-danger.focus {
    box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.5);
  }
  
  .btn-danger.disabled, .btn-danger:disabled {
    color: #fff;
    background-color: #dc3545;
    border-color: #dc3545;
  }
  
  /* outline */
  .btn-outline-primary {
    color: #007bff;
    background-color: transparent;
    border-color: #007bff;
  }
  
  .btn-outline-secondary {
    color: #6c757d;
    background-color: transparent;
    border-color: #6c757d;
  }
  
  .btn-outline-success {
    color: #28a745;
    background-color: transparent;
    border-color: #28a745;
  }
  
  .btn-outline-danger {
    color: #dc3545;
    background-color: transparent;
    border-color: #dc3545;
  }
  
  /* link */
  .btn-link {
    color: #007bff;
    background-color: transparent;
    border-color: transparent;
  }
  
  .btn-link:hover {
    color: #0056b3;
    background-color: transparent;
    border-color: transparent;
  }
  
  /* warning */
  .btn-warning {
    color: #fff;
    background-color: #ffc107;
    border-color: #ffc107;
  }
  
  .btn-warning:hover {
    color: #fff;
    background-color: #e0a800;
    border-color: #d39e00;
  }
  
  .btn-warning:focus, .btn-warning.focus {
    box-shadow: 0 0 0 0.2rem rgba(255, 193, 7, 0.5);
  }
  
  .btn-warning.disabled, .btn-warning:disabled {
    color: #fff;
    background-color: #ffc107;
    border-color: #ffc107;
  }
  
  /* info */
  .btn-info {
    color: #fff;
    background-color: #17a2b8;
    border-color: #17a2b8;
  }
  
  .btn-info:hover {
    color: #fff;
    background-color: #138496;
    border-color: #117a8b;
  }
  
  .btn-info:focus, .btn-info.focus {
    box-shadow: 0 0 0 0.2rem rgba(23, 162, 184, 0.5);
  }
  
  .btn-info.disabled, .btn-info:disabled {
    color: #fff;
    background-color: #17a2b8;
    border-color: #17a2b8;
  }